Oscar Pistorius before the start of proceedings at a Pretoria magistrates court last week. Photo: Reuters

"We have had confirmation from Oscar's legal team that the herbal remedy that he used was called Testis Compositum, which is used to aid muscle recovery," his spokeswoman Janine Hills told AFP.

Last week, the prosecution claimed during the Olympian medallist's bail hearing that police had found two boxes of "testosterone" and needles, but the defence had countered that it was a legal herbal remedy.

Prosecutors said they were awaiting the results of forensic tests to determine what the product was.

Pistorius, 26, an Olympic and Paralympic hero, was freed on bail on Friday ahead of his trial on a murder charge over the Valentine's Day killing of his girlfriend Reeva Steenkamp.

The International Paralympic Committee said the double amputee was tested twice during the London Paralympics in 2012 and tested negative.